The simple interest formula is I=Prt The P represents the principal the principal is

81, 85, 82, 93, 85, 84, 95, 87, 88, 91

The mean is calculated by finding the sum of the data set and dividing by the number of numbers.

Mean=(81+85+82+93+85+84+95+87+88+91)/10=871/10=87.1

The median is the middle number in the data set.

81, 82, 84, 85, 85, 87, 88, 91, 93, 95 

In this case there are 2 middle numbers, so we add them together and divide the sum by 2. 85+87/2=86

The median is 86

The mode is the number that occurs the most often in the data sequence.

81, 82, 84, 85, 85, 87, 88, 91, 93, 95 

The mode is 85